rust/tests/ui/proc-macro/issue-76270-panic-in-libproc-macro.rs

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// aux-build:proc-macro-panic.rs
// edition:2018
// needs-unwind proc macro panics to report errors
// Regression test for issue #76270
// Tests that we don't print an ICE message when a panic
// occurs in libproc-macro (when `-Z proc-macro-backtrace` is not specified)
extern crate proc_macro_panic;
proc_macro_panic::panic_in_libproc_macro!(); //~ ERROR proc macro panicked
fn main() {}